She said: "The special fluid allows us to check converters that we find on our routine visits to scrap dealers against crime reports. With all of their customers having to produce photo ID, we can then trace the person who cashed it in."

"It’s important that all motorists and businesses who own high-clearance vehicles, like 4x4s or vans, are aware of how best to protect themselves as these are easier for criminals to crawl under.”

For more information on how to get vehicles marked, contact Sgt Griffiths on: op_bosscat@west-midlands.pnn.police.uk

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